HPCC-32927 Add a debugging option to allow slow exporters to be tested

[ghalliday]

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Testing:

[github-actions]

Jira Issue: https://hpccsystems.atlassian.net//browse/HPCC-32927

Jirabot Action Result:
Assigning user: [email protected]
Workflow Transition To: Merge Pending
Updated PR

[rpastrana]

seems reasonable. I'd push to change the variable name to include the expected time unit (millis). Also, just confirming this is intended to be an unpublished option

[ghalliday]

Yes, it is only for internal testing, but I thought worth preserving in the source to allow others to test.

[ghalliday]

Changed to delayMs